Ruby Pro

This is a solid Ruby and Rails companion that leans into metaprogramming, testing with RSpec and Minitest, and gem development. You'd reach for it when building Rails apps, writing DSLs, or refactoring legacy Ruby code where idioms matter. It emphasizes Ruby conventions and expressiveness over cleverness, which means you get code that feels Ruby-native rather than translated from another language. The focus on RuboCop integration and performance profiling with benchmark-ips is practical. One thing to note: it explicitly prioritizes readability over performance, so if you're optimizing hot paths in production, you may need to push back on some suggestions or clarify your constraints upfront.